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6370mm2
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cm2 = (10mm)2= 100 mm2.
158112 mm2 or 158.112 cm2
210312 mm2 21031.2 cm2 210.312 m2
1 cm2 = 10 mm*10 mm = 100 mm2 So 0.05 cm2 = 0.05*100 = 5 cm2
4500 cm2 = 0.45 m2.